package com.teamwork.module03.filter;

import com.teamwork.common.constant.RedisConsts;
import com.teamwork.common.util.JwtUtil;
import com.teamwork.common.util.RedisUtil;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisUtil redisUtil;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)   {
        //获取token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //放行
            try {
                filterChain.doFilter(request, response);
            } catch (IOException e) {
                throw new RuntimeException(e);
            } catch (ServletException e) {
                throw new RuntimeException(e);
            }
            return;
        }
        //解析token
        String userid;

        try {
            Claims claims = JwtUtil.parseJWT(token);
            userid = claims.getSubject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("token非法");
        }


        //从redis中获取用户信息
        String redisKey = RedisConsts.LOGIN_PRE + userid;

        Object loginUser =  redisUtil.get(redisKey);

        if(Objects.isNull(loginUser)){
            throw new RuntimeException("用户未登录");
        }
        //存入SecurityContextHolder
        //TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken authenticationToken =
                new UsernamePasswordAuthenticationToken(loginUser,null,null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        //放行
        try {
            filterChain.doFilter(request, response);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (ServletException e) {
            throw new RuntimeException(e);
        }
    }
}


